Malicious PDF — malware analysis report

Static analysis result for SHA-256 db60df4b36e8a85c…

MALICIOUS

PDF

90.9 KB Created: 2021-09-23 03:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 078a369d2f243e4b3ed8dc091eeb56cc SHA-1: 29fb4dbaefe0377a7f381fcbc41b002f175b142a SHA-256: db60df4b36e8a85c805f0dc53c31d44fe539e0bf0ad85fd07d94da9fa2ae116b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a phishing or link farm attack. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=p+filmes+online+gratis PDF link annotation
    • http://pasted-radio.de/web/files/letopimotexule.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zasagirazuzegupoxotezapap.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/mofawa.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/varozinezok.pdfIn PDF document text
    • http://saint-party.com/media/file/68408225348.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/sitamugemosevafij.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/40415340236.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/rubejekudazinabudajon.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/82489481991.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/toxozesajapoxikonafijuli.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/28472214184.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/53067100870.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/tujoxebobifofewelegumu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401cb922c---nonalonubosutaromezuv.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/8129241510.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/23370822156.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c029f489---73827514714.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/devosa.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/36009102245.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/96988427825.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mipabixesado.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/34375561541.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/27418178208.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 19272 bytes
SHA-256: c8f21faca880a3b9a159e564d1298c7f7875d224109e74717fe90710a7c36585
font_01_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B9 10556 bytes
SHA-256: 6b083bd5970ff7f8247b50fb916a870b37621f34464cb72e1173bcd639768aa6

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